Halogen Dipole Material OLED Electron Injection Layer
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Solution Overview
Problem
Conventional organic light emitting diode (OLED) devices require high driving voltage, have low light emission luminance, and short lifespan, along with issues like slow response time and narrow viewing angle.
Innovation Solution
An organic light emitting diode with a transparent electrode formed by reacting a low work function or transition metal based halogen dipole material with a metal reacting to it, along with an electron injection layer including a metal-based halogen dipole material, enhancing light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional organic light emitting diode structures are used, then device simplicity is maintained, but light emission efficiency is low and lifespan is short
Solution Approach 1:
The patent changes the chemical composition parameters of the electron injection layer by incorporating halogen dipole materials (such as CsI, RbI, KI) with specific dipole moments. This parameter change in material composition leads to improved electron injection efficiency and extended device lifespan while maintaining structural simplicity
Solution Approach 2:
The patent uses composite material structures in the electron injection layer, combining halogen dipole materials with other materials to create a composite layer that achieves both high light emission efficiency and extended lifespan. The composite approach allows optimization of both performance metrics simultaneously
2Illumination intensity
If conventional electrode materials are used, then manufacturing simplicity is maintained, but transparency is reduced and sheet resistance is high
Solution Approach 1:
The patent changes the material parameters of the electrode by using halogen dipole materials with specific optical and electrical properties. These parameter changes result in electrodes with high transparency and low sheet resistance while maintaining compatibility with existing manufacturing processes
Solution Approach 2:
The halogen dipole material acts as an intermediary layer between the metal electrode and the organic emission layer. This intermediary material improves both transparency and electrical conductivity without requiring complex manufacturing changes, serving as a bridge that optimizes performance while maintaining process simplicity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution increases light emission efficiency and extends the lifespan of OLED devices by using a low work function metal-based halogen dipole material in the electron injection layer, improving transparency and reducing sheet resistance.
Implementation Method 1
a first material that is one of a group-1 metal based halogen dipole material, a group-2 metal based halogen dipole material, a lanthanide metal based halogen dipole material, or a transition metal based halogen dipole material; and a second material that is a metal reacting to the first material
Implementation Method 2
an electron injection layer provided between the second electrode and the emission layer
Implementation Method 3
electrons injected from one electrode and holes injected from another electrode are combined with each other in an emission layer, thereby generating excitons, and energy is outputted from the excitons to emit light
Data Source
AI summary
An organic light emitting diode includes: a first electrode; a second electrode, the first electrode and the second electrode facing each other; an emission layer provided between the first electrode and the second electrode; and an electron injection layer provided between the second electrode and the emission layer, wherein at least one of the first electrode and the second electrode includes: a first material that is one of a group-1 metal based halogen dipole material, a group-2 metal based halogen dipole material, a lanthanide metal based halogen dipole material, or a transition, metal based halogen dipole material; and a second material that is a metal reacting to the first material.